# Precision numbers...

Hello, with the following code :

```a = rndn(100,1);
print meanc(a-meanc(a));
```

returns something like :

```2.2204460e-017
```

What should I do to get 0 ???

Thanks,

Guillaume Monarcha

0

PS : I use GAUSS ENGINE 13

0

You change the format of your print statements by using the format command. Here is a basic example:

```a = rndn(100,1);

format /rd 8,3;
print meanc(a - meanc(a));
```

This will return:

```  0.000
```

The first input to format, in this case /rd, tells GAUSS to:

1. r - right format the printed output
2. d - print the data as a decimal

The second input to format, in this case 8,3, tells GAUSS to:

1. 8 - give each printed number enough space for 8 characters
2. 3 - print out 3 decimal places
3. If you wanted to print numbers that were left formatted using scientific notation rather than decimal format and wanted to print 4 decimals, you could enter:

```format /le 8,4;
print meanc(a - meanc(a));
```

This will return something like:

```2.2204e-17
```

Besides the d and e options, you can also use the z option. This will use either decimal or scientific notation, whichever is more concise. It will also suppress trailing zeros. Here is a link to another post describing this.

aptech

1,773

0

PS : I use GAUSS ENGINE 13

0

You change the format of your print statements by using the format command. Here is a basic example:

```a = rndn(100,1);

format /rd 8,3;
print meanc(a - meanc(a));
```

This will return:

```  0.000
```

The first input to format, in this case /rd, tells GAUSS to:

1. r - right format the printed output
2. d - print the data as a decimal

The second input to format, in this case 8,3, tells GAUSS to:

1. 8 - give each printed number enough space for 8 characters
2. 3 - print out 3 decimal places
3. If you wanted to print numbers that were left formatted using scientific notation rather than decimal format and wanted to print 4 decimals, you could enter:

```format /le 8,4;
print meanc(a - meanc(a));
```

This will return something like:

```2.2204e-17
```

Besides the d and e options, you can also use the z option. This will use either decimal or scientific notation, whichever is more concise. It will also suppress trailing zeros. Here is a link to another post describing this.